This is why recording is an art, not science. As the above posts show, there are plenty of ways to skin a dynamic vocalist. You need to find the way that works for you, so start experimenting early.
vocalist who work the mic as they do live by backing up and getting closer to the mic can cause all kinds of havoc w/ the tone. Cardiod mics have proximity effect, which results in more bottom in the vocal signal. Also, if the vocalist gets close, small head movements can also change the tone. That may not make a difference to you - but might. Either way, it is something to be aware of.
That is one reason a good room, a good mic and good preamp help. You can crank the input on the preamp up then and capture some of the more delicate stuff w/o crapping out the signal when it gets loud (and not have the room ruin the signal, too). During mixing automation and compression can help level the signal.
I usually run vocals through a nice channel strip and keep everything on, even if I'm not Eqing (except a HP filter) and only compressing a few dBs just to firm the signal up a little, even if it is parellel compressing. I'll usually start at a lower gain, just because many (if not most) musicians tend to play/sing louder during an actual take than during set up. I can then add gain incrementally during takes. If we take the time, I can even ride the levels a bit during the final take(s). I'm a big believer in performance, and seldom comp takes except in sections. Comping word by word seems to be the rage these days and is de rigueur in pop-oriented stuff, but seems like a way to up billing time to me. Doesn't mean I won't do it if technically necessary, but I find it often distracts from the flow, perfection instead of authenticity.
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